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A372444
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The n-th iterate of 27 with A371094.
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10
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27, 165, 8021, 12408149, 19607957362005, 32439509492992549521282389, 58947232705679751034215288252890081792789279233365, 259166427025070423330595967015238989905128148712607202753574381749095993394717720069452733214971221
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OFFSET
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0,1
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LINKS
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FORMULA
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a(0) = 27; for n > 0, a(n) = A371094(a(n-1)).
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PROG
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(PARI)
A371094(n) = { my(m=1+3*n, e=valuation(m, 2)); ((m*(2^e)) + (((4^e)-1)/3)); };
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CROSSREFS
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Sequences derived from this one:
A372443 obtained when Reduced Collatz-function R is applied to a(n-1), for n > 0,
A372448 the 2-adic valuation of 1 + 3*a(n), equal to row index of a(n) in array A257852,
A372454 the difference between a(n) and the term of A086893 with the same binary length.
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KEYWORD
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nonn,changed
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AUTHOR
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STATUS
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approved
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